Tomcat服务器启动后运行一个方法
[英]Run a method after Tomcat server starts
问题描述
I need to start/run method (3 methods declared inside a class) only after Tomcat Server has started and ran.
只有在 Tomcat 服务器启动并运行后，我才需要启动/运行方法（在类中声明的 3 个方法）。 I went over several threads suggesting using Servlet s (listener class) in web.xml .我浏览了几个线程，建议在web.xml使用Servlet s（侦听器类）。 The problem is my class which implements ServletContextListene r runs even before completion of loading Tomcat Server.问题是我的实现ServletContextListene r 的类甚至在加载 Tomcat 服务器完成之前运行。
Note: My web.xml is already tagged to dispatcher servlet looking for any REST API calls.注意：我的web.xml已被标记为调度程序 servlet，以查找任何 REST API 调用。
Ex (Below are few logs to help you understand more):例如（以下是一些日志以帮助您了解更多信息）：
INFO: No Spring WebApplicationInitializer types detected on classpath
Oct 26, 2018 6:20:43 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
.
{{ Connect with MYSQL }}
.
Oct 26, 2018 6:20:50 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'dispatcher'
.
18:20:51.394 [localhost-startStop-1] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/user/someMethod],methods=[POST],produces=[application/xml || application/json]}" onto public java.util.ArrayList<com.x.y.z.User> com.z.y.controllers.UserController.deleteUser(com.x.y.z.User)
18:20:52.090 [localhost-startStop-1] INFO o.s.w.s.m.m.a.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Fri Oct 26 18:20:50 IST 2018]; parent: Root WebApplicationContext
18:20:52.181 [localhost-startStop-1] INFO o.s.w.s.m.m.a.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Fri Oct 26 18:20:50 IST 2018]; parent: Root WebApplicationContext
18:20:52.394 [localhost-startStop-1] INFO o.s.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcher': initialization completed in 2041 ms
Oct 26, 2018 6:20:52 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8081"]
Oct 26, 2018 6:20:52 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8010"]
Oct 26, 2018 6:20:52 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 27236 ms
{{ I want to call methods after Tomcat starts }}
When I initialize the class under ServletContextListener the below log throws up.当我在ServletContextListener下初始化类时，下面的日志会抛出。
INFO: No Spring WebApplicationInitializer types detected on classpath
Oct 26, 2018 6:22:09 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
.
.
{{ Connect with MYSQL }}
.
18:22:16.461 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 6635 ms
**MyClass - myFileWatcher()
The above thread has started**
.
.
As my method has thread it gets stuck even before Tomcat starts completely (the thread should start only when this displays ' INFO: Server startup in 27236 ms ').由于我的方法有线程，它甚至在 Tomcat 完全启动之前就卡住了（只有当显示“信息：服务器启动时间为 27236 毫秒”时，线程才应启动）。
Note: Let me know if I missed something.注意：如果我错过了什么，请告诉我。
1 个解决方案
解决方案1
1 2018-10-26 13:30:59
You can write a @Bean which provides a CommandLineRunner .您可以编写一个提供CommandLineRunner的@Bean 。 Something like this : 像这样的事情：
@Bean
public CommandLineRunner commandLineRunner(SomeAppService someAppService) {
return strings -> {
// do something with someAppService
// this code will run just after the application has fully started
};
}
There are other ways to do this.还有其他方法可以做到这一点。 You can read some related articles here:你可以在这里阅读一些相关的文章：
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